Fix bugs

app.py

@@ -291,13 +291,13 @@ def visualize_cells(pil_img, cells):
     for cell in cells:
         bbox = cell['bbox']
 
-        if cell['column header']:
+        if cell['header']:
             facecolor = (1, 0, 0.45)
             edgecolor = (1, 0, 0.45)
             alpha = 0.3
             linewidth = 2
             hatch='//////'
-        elif cell['projected row header']:
+        elif cell['subheader']:
             facecolor = (0.95, 0.6, 0.1)
             edgecolor = (0.95, 0.6, 0.1)
             alpha = 0.3